package com.chi.javasebasic;

import org.apache.commons.math3.analysis.polynomials.PolynomialFunctionNewtonForm;

import java.util.HashSet;

/**
 * @author chi  2017-07-12 13:59
 **/
public class HashSetTest {
    public static void main(String[] args) {
        HashSet<String> strings = new HashSet<>();
        strings.add("sldfkj");
        boolean r = strings.add("sldfkj");
        System.out.println(r);
    }
}
